package com.fansl.allround.common.security.util;

import cn.hutool.core.codec.Base64;
import cn.hutool.core.util.CharsetUtil;
import lombok.SneakyThrows;
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;

import javax.servlet.http.HttpServletRequest;

/**
 * @author fansl
 * @Description: 认证授权相关工具类
 * @date 2019/7/12 10:34
 */
@Slf4j
@UtilityClass
public class AuthUtils {
    private final String BASIC_ = "Basic ";

    /**
     * 从header 请求中的clientId/clientsecect
     * @param header header中的参数
     * @return
     */
    @SneakyThrows
    public String[] extractAndDecodeHeader(String header){
        byte[] base64Token = header.substring(6).getBytes("UTF-8");
        byte[] decoded;
        try {
            decoded = Base64.decode(base64Token);
        }catch (IllegalArgumentException e){
            throw new RuntimeException("Failed to decode basic authentication token");
        }
        String token = new String(decoded,CharsetUtil.UTF_8);
        int delim = token.indexOf(":");
        if(delim == -1){
            throw new RuntimeException("Invalid basic authentication token");
        }
        return new String[]{token.substring(0,delim),token.substring(delim+1)};
    }

    /**
     * 从header 请求中的clientId/clientsecect
     * @param request
     * @return
     */
    @SneakyThrows
    public String[] extractAndDecodeHeader(HttpServletRequest request){
        String header = request.getHeader(HttpHeaders.AUTHORIZATION);
        if(header == null || !header.startsWith(BASIC_)){
            throw new RuntimeException("请求头中client信息为空");
        }
        return extractAndDecodeHeader(header);
    }
}
